Slow level PID loop with telemetry delay
By Steve Myres on 8 November, 2015 - 12:03 am
Dick, I think it's OK to use a BIT of integral in level control, if it's a case where there's a...
Redundant ControlLogix PLC and a Third Party
What is the generally accepted hardware setup to exchange data between a redundant set of A-B ControlLogix PLC's and a third party?
Air Leak Checks in Low Pressure System
How to find out minor air leaks from polyurethane and push in fittings
Voltage being pulled down in IO panels.
By Roy Matson on 23 November, 2015 - 4:48 pm
> We have numerous Siemens FX300 Vortex flow meters on site. > Every few months these seem...
Different Values between Analog Input to PLC in HMI and Field Instrument.
Analog input current drops only during plant running but in shutdown it's normal.
By Roy Matson on 23 November, 2015 - 4:36 pm
I'm with David, why do you need a signal isolator? Check your loop with a simulator, does it...
Recommended Low-Cost Modbus RTU Mixed-Signal Remote I/O Module
Seeking recommendations for a simple, low-cost Modbus remote I/O module w/ analog I/O, digital I/O, 2A+ relays
By Roy Matson on 23 November, 2015 - 4:16 pm
> Howdy folks! My company is looking for a simple, low cost > Modbus RTU remote IO module...
Vibration Sensor Monitoring
What is the use of system monitor (3300/03) in Bently Nevada.
Can No Longer Verify MODBUS String from Slave Device
Modscan software quit working suddenly, and I cannot reestablish communication with slaves.
Need to add, edit, remove some loops in the logic on Yokogawa Prosafe RS
Real World Examples of Analog Output Card Applications.
What are some real world examples of PLC analog output card usage besides the obvious motion control?
By Curt Wuollet on 21 November, 2015 - 9:50 am
Probably the largest application of analog outputs these days is to control VFDs for moving air,...
By MrAnon on 20 November, 2015 - 12:57 pm
Are you asking about a 4 - 20 mA card? 4 - 20 mA is the standard current signal to final control...
How to establish communication between S5 115U via CP1430 TCP and S7 using a TCP connection with out ISO on TCP connection?
I'm wondering why is that they set 24VDC as standard in industry in the first place?
By Bob Peterson on 20 November, 2015 - 10:12 am
24VDC can indeed generate a spark. If you want to prevent sparks you need to use intrinsic safety...
By Jaise Augustine on 20 November, 2015 - 4:22 am
Dear Friend, 24VDC is a standard. there are some basic reasons for using 24VDC in industries. ...
Monitoring I/O data from a PLC Using Visual Basic
Want to send data to a PLC using visual basic and also read output data from PLC using visual basic.
Trying to find a proper combination of a PLC and Gear Motor for a simple chain conveyor system I'm developing.
M-bus to USB/RS-232 adapter to Convert M-bus to MODBUS
Looking for a recommendation on an m-bus to usb/RS-232 converter to convert from m-bus to MODBUS
How Many PLCs Are Required
How many PLCs are you using in an oil/gas measuring station?
By Brian Cervi on 15 November, 2015 - 1:40 pm
A single medium sized PLC like a Schneidier M340 or M580 can fulfill this role. Make sure that...
By Ikhtiander on 14 November, 2015 - 9:21 pm
Based on your information, you will need at least 2 PLC : - PLC for Process Control or for data...
MODBUS with Different Power Supplies
MODBUS, two different power supplies 12V and 24V.
By Lynn A Linse on 15 November, 2015 - 6:25 pm
The supply voltage probably won't be an issue, but you may suffer burn-outs if your grounding is...
Hi, I'm new to this forum. Modicon Quantum PLC fault.
Problem Saving Data on Delta PLC
Delta PLC overwriting data at shutdown
MODBUS TCP over IPSec VPN
Trying to get MODBUS TCP over IPsec VPN
Bently Nevada Vibration Monitor
Connecting/using Bently Nevada vibration monitors
Connecting 2, 3, and 4 Wire Current Loops
Connecting 2, 3, and 4 wire current loops to the same current sinking PLC input card whilst avoiding ground loops.
Separate Instrument Earth Pit
Separate Instrument Earth pit not available
By Roy Matson on 10 November, 2015 - 7:39 pm
I'm not sure if anyone has pointed it out but your instrument shields must not be connected to...
Time Synchronisation in GE 369 and 469
I want to time synchronize GE 369 and 469 relays
MODBUS on Siemens S71200 PLC
Writing to Siemens S71200 PLC using TCP/IP MODBUS
By Steve Myres on 9 November, 2015 - 6:15 pm
I just realized I may have misread your question about reading and writing "from" the...
By Steve Myres on 9 November, 2015 - 3:09 pm
Insert an MB_SERVER FB (from one of the folders near the bottom of the Instruction task card). ...
Migration from SLC500 to 5000
Time to migrate to 5000 platform
By Jeremy Pollard on 8 November, 2015 - 12:32 pm
BillyMac... good morning... as Bob Peterson said, I would love to be involved in the...